Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/ShepardtagR2422tp.ps Дата изменения: Wed Jun 11 19:00:30 2008 Дата индексирования: Mon Apr 6 06:13:30 2009 Кодировка: Поисковые слова: annular solar eclipse

Proposal Identification No.: R2422 Date Received: 2008­May­30 13:02:35
Technical Page
Proposal Type: Regular
General Category: Planetary Radar
Sub­Category: Radar
Observation Category: Solar System
Total Time Requested: 22 Hours
Minimum Useful Time: 2h
Proposal Title: Continuation of Long­term Survey of Main­Belt M and X­class Asteroids.
ABSTRACT:
We propose to observe two M­class asteroids,261 Prymno (new target) and 785 Zwetana (previously observed) with
the S­band radar to constrain their physical properties, focusing specifically on their composition (metallic or not).
Zwetana is of special interest because it shows the largest rotational variation in radar albedo of any asteroid
observed, ranging from a low of 0.10 to a high of 0.60. Our previous work suggests this is not due to shape or
compositional variations, but may be due to variations in regolith thickness or large­scale facets that were favorably
oriented during the last encounter. Our goals for these observations are to determine (1) if Prymno has a high
radar albedo or not (correlated with metallic content), and (2) to verify the previously observed large swings in
radar albedo for Zwetana.
Name Institution E­mail Phone Student
Michael K Shepard Bloomsburg Univer­
sity of Pennsylvania
mshepard@bloomu.edu 570­389­4568 no
Remote Observing Request
X Observer will travel to AO
Remote Observing
In Absentia (instructions to oper­
ator)
Instrument Setup
S­Band radar S­band receiver
Atmospheric Observation Instruments:
Special Equipment or setup: none
RFI Considerations
1

Frequency Ranges Planned
2